#buttonToTop {
    display: inline-block;
    background: -o-linear-gradient(135deg, #00569c 0%, #1672bc 100%);
    background: linear-gradient(315deg, #00569c 0%, #1672bc 100%);
    width: 50px;
    height: 50px;
    text-align: center;
    border-radius: 333px;
    position: fixed;
    bottom: 30px;
    right: 30px;
    -webkit-transition: background 0.3s, opacity 0.5s, visibility 0.5s;
    -o-transition: background 0.3s, opacity 0.5s, visibility 0.5s;
    transition: background 0.3s, opacity 0.5s, visibility 0.5s;
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}
#buttonToTop::after {
    content: "\f077";
    font-family: FontAwesome;
    font-weight: normal;
    font-style: normal;
    font-size: 25px;
    line-height: 50px;
    color: #fff;
}
#buttonToTop:hover {
    cursor: pointer;
}
#buttonToTop:active {
    /* background: #fff; */
}
#buttonToTop.show {
    opacity: 1;
    visibility: visible;
}

@media screen and (max-width: 768px) {
    #buttonToTop {
        bottom: 90px;
        right: 15px;
    }
}